CVE-2026-66334AMI AptioV >= AptioV_5.0 and < AptioV_5.046 Out-of-bounds Write
NVD
Vulnerability Summary
AMI APTIOV contains vulnerabilities in BIOS where
privileged users may cause the “Out-of-Bounds Write” by
local access. Successful exploitation of this vulnerability may lead to a
denial of service during firmware update processing, such as a crash or failed
update if the out-of-bounds write hits unmapped memory. It could also impact Integrity, and Availability.
privileged users may cause the “Out-of-Bounds Write” by
local access. Successful exploitation of this vulnerability may lead to a
denial of service during firmware update processing, such as a crash or failed
update if the out-of-bounds write hits unmapped memory. It could also impact Integrity, and Availability.
CVSS v4.0 Base Metrics — Score 6.8 (MEDIUM)
CVSS:4.0/AV:L/AC:L/AT:N/PR:H/UI:N/VC:N/VI:H/VA:H/SC:N/SI:N/SA:NAttack VectorLocal
Attack ComplexityLow
Attack RequirementsNone
Privileges RequiredHigh
User InteractionNone
Confidentiality (Vulnerable System)None
Integrity (Vulnerable System)High
Availability (Vulnerable System)High
Confidentiality (Subsequent System)None
Integrity (Subsequent System)None
Availability (Subsequent System)None
Affected & Patched Versions
- AMI AptioV >= AptioV_5.0 and < AptioV_5.046
- AMI AptioV AptioV_5.046
What to do
Fix it during your normal patch cycle. No exploitation is confirmed yet.
- Check whether you run AMI AptioV >= AptioV_5.0 and < AptioV_5.046 and which version.
- Update to a patched version listed above, then confirm the new version.
Timeline
- Nov 10, 2026Published
- Nov 13, 2026Record last modified
Score, severity and exploitation changes are tracked from the day Watchtower started logging them.
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Data last checked: Nov 14, 2026 02:13 UTC